"Milk scales typically came in 10-pound increments (as the scale slide is pulled down with weight, the hand goes around three times) for 30 pounds maximum weight and 20 pounds (again, the hand goes around three times) for 60 pounds maximum weight."

From

https://www.farmcollector.com/farm-life/milk-scales-milk-tester

The calendar is (most likely) from The Knudsen Milk Products Co. The earliest available city directory is dated 1957 when the company representative was Fred Olsson. I'm sure Fred could tell us who the young man might be.

I think it is 72(32+40) minus 14(6+8)= 58. The numbers are a bit hard to read.

The sums of numbers must have carried more weight back then.

[Whatever that means. - Dave]

To equal 58?

Still dealing moo juice in the Golden State, 78 years later.